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/**
* Test injectors
*/
import produce from 'immer';
import { memoryHistory } from 'react-router-dom';
import identity from 'lodash/identity';
import configureStore from '../../configureStore';
import getInjectors, { injectReducerFactory } from '../reducerInjectors';
// Fixtures
const initialState = { reduced: 'soon' };
/* eslint-disable default-case, no-param-reassign */
const reducer = (state = initialState, action) =>
produce(state, draft => {
switch (action.type) {
case 'TEST':
draft.reduced = action.payload;
break;
}
});
describe('reducer injectors', () => {
let store;
let injectReducer;
describe('getInjectors', () => {
beforeEach(() => {
store = configureStore({}, memoryHistory);
});
it('should return injectors', () => {
expect(getInjectors(store)).toEqual(
expect.objectContaining({
injectReducer: expect.any(Function),
}),
);
});
it('should throw if passed invalid store shape', () => {
Reflect.deleteProperty(store, 'dispatch');
expect(() => getInjectors(store)).toThrow();
});
});
describe('injectReducer helper', () => {
beforeEach(() => {
store = configureStore({}, memoryHistory);
injectReducer = injectReducerFactory(store, true);
});
it('should check a store if the second argument is falsy', () => {
const inject = injectReducerFactory({});
expect(() => inject('test', reducer)).toThrow();
});
it('it should not check a store if the second argument is true', () => {
Reflect.deleteProperty(store, 'dispatch');
expect(() => injectReducer('test', reducer)).not.toThrow();
});
it("should validate a reducer and reducer's key", () => {
expect(() => injectReducer('', reducer)).toThrow();
expect(() => injectReducer(1, reducer)).toThrow();
expect(() => injectReducer(1, 1)).toThrow();
});
it('given a store, it should provide a function to inject a reducer', () => {
injectReducer('test', reducer);
const actual = store.getState().test;
const expected = initialState;
expect(actual).toEqual(expected);
});
it('should not assign reducer if already existing', () => {
store.replaceReducer = jest.fn();
injectReducer('test', reducer);
injectReducer('test', reducer);
expect(store.replaceReducer).toHaveBeenCalledTimes(1);
});
it('should assign reducer if different implementation for hot reloading', () => {
store.replaceReducer = jest.fn();
injectReducer('test', reducer);
injectReducer('test', identity);
expect(store.replaceReducer).toHaveBeenCalledTimes(2);
});
});
});
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